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Synfacts 2025; 21(07): 722
DOI: 10.1055/a-2601-4661
Polymer-Supported Synthesis

Aerobic Oxidation of Benzyl Alcohols Using SO4 2– and a Nitrogen-Containing TiO2 Photocatalyst

Contributor(s):
Yasuhiro Uozumi 
,
Aya Tazawa
Yu D, Zou J *, Zeng L, Hou Y, Lin W, Wu L, Anpo M, Yu JC, Zhang J *, Wang X *. Fuzhou University, Jiangxi Academy of Sciences, Nanchang and Jiangxi Carbon Neutralization Research Center, Nanchang, P. R. China
Lewis and Brønsted Acids Synergy in Photocatalytic Aerobic Alcohol Oxidations.

Angew. Chem. Int. Ed. 2025;
64: e202425551
DOI: 10.1002/anie.202425551
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Keywords

photocatalysis - Lewis acid - Brønsted acid - aerobic oxidation - benzyl alcohols

Significance

A TiO2 nanocatalyst having N and SO4 2– sites on its surface was prepared according to equation 1. Thus, TiO2 and oleylamine were mixed and heated at 200 °C, followed by calcination at 450 °C to afford N-doped TiO2 (N-TiO2 ). N-TiO2 was treated with 0.9 M H2SO4 and the resulting solid was calcinated at 450 °C to give SO4 2–/N-TiO2 . SO4 2–/N-TiO2 promoted the aerobic oxidation of benzyl alcohols at 1 bar of O2 in benzotrifluoride under 420 nm LED irradiation to afford the corresponding benzaldehydes in up to 99 % conversion and 99 % selectivity (eq 2).


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Comment

SO4 2–/N-TiO2 was characterized by means of XRD, UV/Vis DRS, FTIR, Raman, SEM, TEM, HRTEM, EDX, XPS, ESR, NH3-TPD, and O2 uptake measurements. In the aerobic oxidation of benzyl alcohol, SO4 2–/N-TiO2 was recovered and reused twice with only a gradual loss of its catalytic activity (3 rd run, < 50 % conversion). The recovered catalyst after the third run was reactivated by H2SO4 treatment and reused in a fourth run, which improved the conversion to 85 %.


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Publication History

Article published online:
23 June 2025

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